FAB-U-LOUS!! As I was working on some cabs the last couple days, fingers cramping up as I held tightly to a small thing in one hand & firmly to sandpaper with the other, I knew there had to be a better way. And better than the "scumbuster" idea I'd tried a few years ago & found too cumbersome. THIS WAS IT!! I ended up spending about $40 on an Oral B and a pack of refills, the Oral B was the only one at the store with just the round brush, the rest had a round & a square below it. But it is perfect & well worth the $$. Though I'd recommend to anyone to try to find a cheaper version if possible. There was a pack of store-brand refills there (refills were the pricey part, the main brush was only $12), but it was impossible to tell if they'd fit it, none of the names matched anything, so I spent the extra $7 for something I knew would work & got the Oral B brand ones. THANK YOU!!!!